Galena
Image: Robert M. Lavinsky (CC BY-SA 3.0)
Mineral NameGalena
Chemical FormulaPbS
Mohs Hardness2.5
Crystal Systemcubic
Lustermetallic
Streak Colorlead gray
Cleavageperfect cubic (three directions at 90°)
Fractureuneven
Specific Gravity7.5
Colorslead gray, silvery gray
Transparencyopaque
Type LocalityHuelgoat, Finistère, Brittany, France
Mineral Groupsulfides
Useslead ore, historical radio detectors, collector's item
Associated Mineralssphalerite, pyrite, chalcopyrite, quartz, fluorite, barite
Raritycommon
Description
Galena typically forms distinct, often cubic or cubo-octahedral crystals with a brilliant metallic luster and a characteristic lead-gray color. The specimen shown features well-formed, intergrown cubic crystals with a bright, reflective surface.
Geological Context
Galena is a primary ore of lead and is commonly found in hydrothermal veins, often associated with other sulfide minerals. It can also occur in sedimentary deposits, particularly in limestone, where it forms through replacement processes.
